The 60-story Porsche Design Tower is no exception, and now it's attracting billionaires at rapid speed.

Though it won't be ready for move-in until 2016, 22 billionaires (2% of the world's total) have purchased units there so far, according to the Atlantic Cities. And they're going fast — 80% of the 132 units are already under contract, representing a whopping $624 million in sales.

Like many of the other luxury condo developments in Miami-Dade County, the Porsche Design Tower has some crazy amenities, including a movie theatre, spa, and plunge pools on almost every balcony.

The tower's most distinctive feature, however, is clear from its name. Three car elevators will bring billionaires and t…